Keto is unsustainable in the long term and extremely difficult to even maintain in the short term. I’ve done it twice, for 3 months at a time each time, and it was VERY effective. Kept the weight off, too. But it almost felt as if it permanently changed the makeup of my microbiome. While I was doing keto, I was a lightweight in terms of alcohol, something I expected because I’d read that others had a similar experience; but not just that, even a fucking TYLENOL would make me feel noticeably altered. That went away, albeit slowly, after I started eating carbs a bit more normally again; but not fully. I am more sensitive now to all substances than I was before I did keto: for example, my tolerance to MDMA went down, and I thought I had lost the magic. Likewise any and all meds or drugs. My theory about this is that perhaps keto cleared out the “biofilm” that supposedly exists in the gut, and paved the way for some fresh intestinal flora and fauna?? But I have no fucking clue, really.